Delta 3D printers are known for their special kinematics. The print head tip is moved by three linear axes, which enable complex path curves. However, this design also presents challenges. Maker Bruno Schwander has optimized his Anycubic Kossel with three specific modifications to improve precision and handling.
One key point was to reduce the moving mass of the print head. Schwander replaced the original hotend with a more compact and lighter MQ Mozzie. The reduced weight was intended to improve repeat accuracy. However, the modification led to problems with cooling. To solve this, he integrated a powerful brushless fan, which is actually designed for hair dryers. As this requires a 0-5 V DC input, while the Marlin firmware works with 12V PWM signals, an adapter was required.
Once the fan was ready for use, Schwander developed a remote mount. A 3D-printed air duct makes it possible to attach the fan to the frame of the printer. The connection to the hotend is made via a flexible hose made of lightweight nylon fabric with integrated rubber to maintain tension. The design is visually reminiscent of an elephant’s trunk.
Another problem was the Z-calibration. The factory solution with a separate Z-sensor proved to be impractical. Schwander decided to convert the entire print bed into a sensor. To do this, he mounted twelve strain gauges on a special multi-layer support ring under the glass plate. The signals are recorded by an HX711 amplifier and forwarded to the Marlin firmware via an Arduino. As soon as the nozzle touches the bed, the signal is output for calibration.
The combination of these three modifications improves the precision of the printer, optimizes cooling and simplifies handling. He explains his approach on his blog and in a video.
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